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A solution contains of ethanol () and of water (). The mole fraction of ethanol is

  1. A
  2. B
  3. C
  4. D

Answer: B

Ethanol = 46/46 = 1 mol; water = 36/18 = 2 mol. Mole fraction of ethanol = 1/(1+2) = 0.333.
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More questions on Concentration terms (molarity, molality, mole fraction, ppm) and dilution